6
Impulses Panel
The IMPULSES panel provides a list of all impulse response les (along with their re-
spective ID numbers in the left column) that currently reside on your Helix device.
What are Impulse Responses?
Impulse responses (or “IRs”) that can be used in Helix are .wav les that are the result
of capturing the sound of a test tone (frequency sweep) through a guitar or bass amp
speaker cabinet, which has been de-convolved with the original tone signal. This rep-
resents the frequency response of the cabinet itself and can be used to simulate the
way it alters the sound. This is similar to a convolution reverb, but with a much shorter
decay.
IR Formats and Restrictions
Helix can import any mono or stereo .wav le IR, regardless of its bit depth, length, or
sample rate frequency. While this is very convenient, please be careful not to load just
any .wav le as an IR or you may experience unexpected sonic results. SysEx les are
not supported by Helix.
Importing and Exporting Impulse Responses
To access the impulse responses stored on your Helix device, click on the IMPULSES
tab. From here you will be presented with a list of impulse responses and their index
numbers. Your Helix device will access these IRs by their index only. They are not di-
rectly associated with presets.
To import an IR to an index, rst select the desired index location in the application's
IMPULSES list and click Import. Continue through the Open window to select the de-
sired .wav le you wish to load onto your Helix device.
To export an IR, click Export to display the Save As dialog.
By default, IRs are saved to:
• Mac
®
- /Documents/Line 6/Tones/Helix/IRs folder
• Windows
®
- \My Documents\Line 6\Tones\Helix\IRs folder
You may also drag and drop to and from the IMPULSES list view to export and import
IRs - see the following section.
TIP: Exporting your complete list of IRs is a nice way to keep a backup of them
all in one place on your computer. It is helpful to name your exported IR les with
their stored index ID number to easily identify how they should match up with an
exported Helix bundle to make more comprehensive backups.
Renaming, Copying, Pasting & Clearing IRs
These functions can be performed by clicking the buttons above the IMPULSES list
view and will act upon the selected (highlighted) IR. You can also Right-Click/Ctrl+Click
to choose these options from the context menu (or use the app's "Keyboard Short-
cuts").
Drag and Drop IRs
It is possible to drag and drop single, or multiple, .wav les from your computer’s desk-
top or le window directly into the IMPULSES list view to import them at once. You
can also drag and drop from the IMPULSES list view directly to your computer to do
an export.
It is also possible to drag and drop IRs within the IMPULSES list view to create a copy
of the IR in a new index location. Please note that you cannot move or swap IRs in a
single operation, thereby reducing the risk of unintentionally breaking the link of a spe-
cic IR index and its corresponding Helix preset. Use the Clear function to remove IR
les from your Helix device's memory if they are no longer needed.
Loading an IR in an IR Block
Once you've inserted an IR type block in your preset's signal ow, you can load an IR
le from your IR library in one of two ways:
• Select the IR block within the Helix app's signal ow, then, in the Home tab
of the EDITOR Window, click the Impulse Response Menu and select the
desired IR le.
• Click on the desired IR within the LIBRARIAN - Impulses list and drag & drop
it directly onto the Impulse Response Menu within the Home tab.
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